There is no friction between the disc and seat within the full travel range of disc opening and closing, so that the leakage caused due to seat abrasion during seat opening and closing in rotary control valves is eliminated. The seat adopts the multi-level structure and uses the combination of metal and nonmetal materials to form the sealing face. It can work excellently under the service conditions of high and low temperatures. The 70D00 Series butterfly valve is featured by long service life and excellent sealing performance. It is suitable for control and shut-off applications of almost all gases and liquids in the industrial process control. 

Parameters of control valves:
Trim features:Body type:Bonnet type:Flow characteristic:Size:Pressure class:Leakage class:Pipe connection type:Applicable temperature range:Actuator type: